BusinessWeek: Representative Henry Waxman called the chief executive officers of AT&T Inc., Verizon Communications Inc., Caterpillar Inc. and Deere & Co. to provide evidence to support costs the companies plan to book related to the new health-care law. Waxman of California, chairman of the House Energy and Commerce Committee, and subcommittee Chairman Bart Stupak of Michigan released letters they wrote to the executives, saying their plans to record expenses against earnings as a result of the law contradict other estimates. The lawmakers requested the executives appear at hearing Stupak plans on April 21.